From: Phil Carmody <ext-phil.2.carmody@nokia.com>
Date: Tue, 15 Dec 2009 02:00:29 +0000 (-0800)
Subject: err.h: add helper function to simplify pointer error checking
X-Git-Tag: v2.6.33-rc1~153
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=603c4ba96be998a8dd7a6f9b23681c49acdf4b64

err.h: add helper function to simplify pointer error checking

There are quite a few instances in the kernel of checks of pointers both
against NULL and against the errno range, handling both cases identically.
This additional helper function would simplify such code.

[akpm@linux-foundation.org: build fix]
Signed-off-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/linux/err.h b/include/linux/err.h
index ec87f3142bf3..1b12642636c7 100644
--- a/include/linux/err.h
+++ b/include/linux/err.h
@@ -34,6 +34,11 @@ static inline long IS_ERR(const void *ptr)
 	return IS_ERR_VALUE((unsigned long)ptr);
 }
 
+static inline long IS_ERR_OR_NULL(const void *ptr)
+{
+	return !ptr || IS_ERR_VALUE((unsigned long)ptr);
+}
+
 /**
  * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
  * @ptr: The pointer to cast.